------------[ cut here ]------------
WARNING: CPU: 1 PID: 6929 at fs/bcachefs/fs-io.c:361 __bch2_truncate_folio+0x17a2/0x1a40 fs/bcachefs/fs-io.c:361
Modules linked in:
CPU: 1 UID: 0 PID: 6929 Comm: syz.1.146 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__bch2_truncate_folio+0x17a2/0x1a40 fs/bcachefs/fs-io.c:361
Code: 5f 5d e9 01 49 c4 06 cc e8 5b b5 88 fd 48 c7 c7 b5 6e 0b 8d e8 7f 5f e9 ff 89 05 89 b4 eb 14 e9 43 ea ff ff e8 3f b5 88 fd 90 <0f> 0b 90 e9 23 f9 ff ff e8 a1 99 c0 06 e8 2c b5 88 fd be 00 10 00
RSP: 0018:ffffc90004bc79e0 EFLAGS: 00010293
RAX: ffffffff8435a701 RBX: 0000000000000000 RCX: ffff888024419dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004bc7bb0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940002da1d9 R12: 1ffff1100ba36742
R13: dffffc0000000000 R14: ffff88805d1b3a10 R15: 0000000000000000
FS:  00007fcd4bc0e6c0(0000) GS:ffff8881269c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000309a0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 bch2_truncate_folios fs/bcachefs/fs-io.c:400 [inline]
 bchfs_fallocate+0x233/0x680 fs/bcachefs/fs-io.c:777
 bch2_fallocate_dispatch+0x28d/0x410 fs/bcachefs/fs-io.c:836
 vfs_fallocate+0x672/0x7f0 fs/open.c:342
 ksys_fallocate fs/open.c:366 [inline]
 __do_sys_fallocate fs/open.c:371 [inline]
 __se_sys_fallocate fs/open.c:369 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:369
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd4d9aebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcd4bc0e038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fcd4dbd5fa0 RCX: 00007fcd4d9aebe9
RDX: 0000000000000002 RSI: 0000000000000010 RDI: 0000000000000004
RBP: 00007fcd4da31e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007fff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcd4dbd6038 R14: 00007fcd4dbd5fa0 R15: 00007fffe19b8a78
 </TASK>